[mythtv-users] Fwd: Playback of recordings end prematurely

[Julian Cerruti]

Hi Mike,

:-)

Thanks for the background. Could you please point me to the tickets that
reference this problem? Who knows, maybe one day, in a parallel universe, I
will have time, skill and thoroughness enough that I may want to take a
crack at it. Or, it could just satisfy my technical curiosity to understand
what the problem is in more detail.

Regards,

Julian

On Wed, Aug 27, 2008 at 10:42 PM, Michael T. Dean
<mtdean at thirdcontact.com>wrote:

> On 08/27/2008 07:12 PM, Julian Cerruti wrote:
> > I wonder if someone could give me some advice on how to go about
> > resolving this issue.
> >
> > For a long while (I don't know when this started, probably about a
> > year ago) all the recordings from shows end earlier than their real
> > length when played from the mythTV "watch recordings" page. For
> > example, when I record a program of 30 minutes length, playback shows
> > a duration of 23:47. I noticed that the recording is indeed longer
> > than that, for example, by playing back the .mpg file externally using
> > mplayer. Also, depending on how playback is configured in mythTV, it
> > would continue playing past 23:47, only the progress counter would
> > stop moving (it remains in 23:47 of 23:47) and also many navigation
> > functions (FFWD, RWD) are lost. Also is commercial auto-skip. In fact:
> > I have a slight suspicion that in many cases, commercial flagging is
> > not worken as well as it could because of this.
> >
> > A couple more details: I notice that the "end time" reported by the
> > mythTV player is suspiciously similar for similar length recordings.
> > Something like: 30 mins -> 23:47; 1hr -> 47:58; etc. Also, I verified
> > the guide data is reasonably OK (this time discrepancy doesn't seem to
> > come from there). I am currently running mythtv 0.21 from mythbuntu
> > 8.04.1 out-of-the-box. I use a Hauppauge 500 with ivtv 1.1.0. Only
> > unusual setting is that because of my location (Argentina) I'm using
> > Pal-Nc and a custom-written XMLTV grabber.
> >
> > Any advice on how to go about diagnosing this or tips to try to fix it
> > would be greatly appreciated.
>
> The approach Myth uses to calculate duration of the recordings is
> imprecise with certain types of shows (i.e. shows broadcast with one
> frame rate while part--such as commercials--use another).  The "issue"
> is purely cosmetic but fixing it properly is a /lot/ of work, so fixing
> it has been very low priority (for the couple of years the plan has been
> in place to fix it).
>
> There are tickets related to the issue and it will eventually be fixed.
> Until then, just get used to how your local channels work and "adjust"
> in your head.  Soon, when someone says, "Let's meet in an hour," you'll
> show up 1 hour 8 minutes and 34 seconds later and get accused of being
> late, but you'll know--from watching your TV shows--that 52:30 is really
> one hour, so you're actually on time.  :)
>
> Mike
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